My vision was not just extension_builder/ExtBase, but to reduce the initial development costs for many other frameworks. So extension_builder was not a good fit for this specific vision I had. This tool will slowly cover many front-end frameworks as well. As informed to Richard, I want to make it open-source as soon as I cover my development costs.

By the way, pre-launch registrations are also open, to have a look at the GUI.

I guess it is mandatory according to TYPO3 by-laws to have the development covered under open source licenses in the first place. As far as I understood the project will be hosted on codecifer.com - but not on builder.typo3.org - correct?

As informed, we can make this project open-source if our current development cost of is fully taken care. In such case the builder tool, as well as the project designer can be hosted on builder.typo3.org.
The CodCifer project will then be be separated out, which can cater to other frameworks.

Please have a look at the promotional videos and GUI usage videos at our channel:YouTube